Dielectric and micromechanical studies of barium titanate substituted (1-y)Pb (Zn(1/3)Nb(2/3))O(3)-yPT ferroelectric ceramics

Dielectric studies have been carried out on barium titanate substituted lead zinc niobate ferroelectrics ceramics, (Pb(0.88)Ba(0.12))[(Zn(1/3)Nb(2/3))(0.88)Ti(0.12))]O(3) and (Pb(0.8)Ba(0.2))[(Zn(1/3)Nb(2/3))(0.8)Ti(0.2))]O(3). The dielectric dispersion of the solid solutions has been studied as a function of temperature in the frequency range 100 Hz-1MHz. The temperature variation of the real components of dielectric permittivity (epsilon') at different frequencies shows a diffuse phase transition. Micromechanical studies have been carried on (Pb(0.88)Ba(0.12))[(Zn(1/3)Nb(2/3))(0.88)Ti(0.12))]O(3) and (Pb(0.8)Ba(0.2))[(Zn(1/3)Nb(2/3))(0.8)Ti(0.2))]O(3) by nanoindentation at different loads. Hardness, Young's modulus, elastic energy and total energy have been extracted. It is seen that in case of (Pb(0.8)Ba(0.12))[(Zn(1/3)Nb(2/3))(0.8)Ti(0.2))]O(3), the plastic deformation energy is lower than the other sample, which is due to extra Ti content in B-site. This is also reflected in polarization studies, which confirms that the presence of Ti(4+) in B-site brings forth rigidity in Ti-O bond